9b. Presentation - Widen Arrivals Roadway Approach Amendment
Item No. 9b_supp Date of Meeting November 9, 2021 Widen Arrivals Roadways Design Authorization Increase and Contract Amendment Presentation Outline Commission Questions from previous meeting What is the current and future roadway level of service? What does congestion look like over time? How has lane flexibility (e.g. HOV lane) been integrated with the design effort? Was there an environmental review? What was the result? How does this project relate to the Sustainable Airport Master Plan? Review of September presentation (if needed) 2 Widen Arrivals Roadways Level of Service What is the current and future level of service? Evening (8pm-11pm) is the peak period of activity Existing average August day (51.8 MAP in 2019) LOS F (congested flow with an average travel speed <10 mph) Future average August day (61 MAP) No improvements, remains at LOS F With improvements, improves to LOS D (medium flow condition with localized queueing) 3 Widen Arrivals Roadways Congestion (Existing) Terminal Curbside Existing Conditions (2019) Dep./Arr. Split 51.8 Million Annual S 170th St Bridge Passengers Return Loop Merge August average day conditions S 160th St Bridge Evening peak is peak period AM Peak Noon Peak Evening Peak Queue starts at Return Loop Merge 4 Widen Arrivals Roadways Congestion (Future) Terminal Curbside Future Conditions Dep./Arr. Split 61 Million Annual Passengers S 170th St Bridge August average day evening Return Loop Merge peak conditions S 160th St No Build queue starts at I-5 Bridge (2.6 miles) Existing No Build With Project 5 Widen Arrivals Roadway Congestion Average Travel Time from Clock Tower to Curb/Garage Future No Future With Direction / Location Existing Build Project To Departures Curbside 5.4 16.2 2.4 To Arrivals Curbside 6.7 15.8 2.7 To Ground Transportation Center 7.2 16.0 2.8 To North Parking Garage Entrance 6.2 15.0 2.4 Note: Travel times are measured in minutes and represent the August average day evening peak period. 6 Widen Arrivals Roadways Lane Flexibility Per Chapter 46.61.165 RCW Preferential lanes (e.g., HOV lanes) are limited to: Public transportation Motorcycles Private vehicles carrying specified number of passengers Commercial ground transportation services that have capacity to carry eight or more passengers 7 Widen Arrivals Roadways Lane Flexibility The project did not evaluate the use of preferential lanes There are challenges at SEA implementing preferential lanes State Route 518 does not have preferential lanes HOV facilities serving the region are typically defined as two or more passengers. The majority of private vehicles entering SEA meet that definition. Number of total travel lanes limited by existing constraints (light-rail transit guideway and airfield) Airport terminal roadway system is complex; continuous preferential lane likely not feasible (merging, diverging, weaving sections) 8 Widen Arrivals Roadways Lane Flexibility EB SR518 WB SR 518 Arrivals To Ground Trans. Air Cargo Rd Return Departures Loop Ramp Airport Arrivals Airport Arrivals/ Expressway Expressway Parking Airport Expressway S 170th St. To Parking 9 Widen Arrivals Roadways Lane Flexibility Transition Zone - signage indicating prefere ntial lane Cell Phone Two lanes to Departures Lot Preferential lane to Arrivals Two lanes to Arrivals and Ground Transportation Center S 170 St th One lane to Parking 10 Widen Arrivals Roadway Lane Flexibility Terminal Curbside Future Conditions Dep./Arr. Split 61 Million Annual Passengers S 170th St Bridge August average day evening Return Loop Merge peak conditions S 160th St No Build queue extends to I-5 Bridge Preferential lane queue extends onto SR518 towards No Build Pref. Lane With Project I-5 11 Widen Arrivals Roadways Lane Flexibility Transition Zone - signage indicating lane ut ilization One lane to Ground Transportation Center Cell Phone Two lanes to Departures Lot Two lanes to Arrivals Strategy: St S 170 th Preferential access for public One lane to Public Parking parking and ground transportation Balance lane capacity with facility capacity 12 Widen Arrivals Roadways Environmental Review Was there an environmental review? What was the result? SEPA checklist completed May 13, 2021 Port issued a determination of non-significance June 9, 2021 Only one comment was received Department of Ecology letter identifying that contamination may be encountered from the historic Asarco Smelter 13 Sustainable Airport Master Plan (SAMP) Widen Arrivals Roadways is independent of SAMP NTP Widen Arrivals Roadways addresses existing demand SAMP NTP addresses future demand Removed from SAMP NTP environmental review "The Project is an independent action but will be designed to accommodate the NTPs (e.g., room for a potential expanded utility corridor under the Project and design consistent with the horizontal and vertical alignments of the proposed North Airport Expressway relocation). With or without the SAMP NTPs, this Project would occur and will be constructed independently. Construction of this Project does not impact Port choices or decisions regarding whether and what SAMP NTP projects may occur." 14 COMMISSION PRESENTATION SLIDES FROM SEPTEMBER 28, 2021 15 Project Scope Scope Items: Provide an additional two lanes for a total of six lanes from S 170th Street into the Departures and Arrivals curbsides and Main Garage Relocation of utility infrastructure systems to support widening Relocate the rental car bus curb to the north Demolish the bridge from Departures drive to the Main Garage Complete seismic retrofit of north portal of Service Tunnel Replacement of power and water utility infrastructure systems that are past their useful life 16 Justification Original roadway system designed to support overall activity level of 25 million annual passengers (MAP) In 2019 (51.8 MAP) significant roadway congestion and queueing occurred during peak periods With return of airport activity levels congestion and queueing has returned during peak periods Queueing could reach I-5/I-405 interchange on a regular basis during summer months in the near-term 17 Location Reconfigure from four to five lanes Rental Car Bus Curb Widen from Arrivals Departures Air Cargo four to six lanes S. 170 Drive Drive Road St. th Lane to GTC Note: Utility corridor included in exhibit, but not included in project scope. Lane to Parking 18 Resolution of Scope Risk Airport Utilities Master Plan Utility Corridor required to support SAMP near-term projects Not included with Widen Arrivals Roadways Project Designing improvements to support future construction Utility infrastructure system expansion to support SAMP near- term projects Not included with Widen Arrivals Roadways Project (outside limits) Replacement of aging utility infrastructure systems Portion included within Widen Arrivals Roadways Project 19 Budget Increase Overall project budget increased to $79.3 million Previous Budget $50,000,000 Roadway Realignment (SAMP NTP) $18,000,000 Replace Aged Utility Infrastructure Systems $3,000,000 Operational/Customer Scope Enhancements $3,000,000 Other Construction Costs (traffic control, etc.) $5,300,000 Revised Budget $79,300,000 20 Project Schedule Project will be delivered through two phases Early Work Bridge Demolition Design Complete: Q4 2021 Construction Start: Q2 2022 In-Use Date: Q3 2022 Main Contract Design Complete: Q4 2022 Construction Start: Q2 2023 In-Use Date: Q4 2025 21 Cone of Certainty We are here 22 Project Risks RISK DESCRIPTION PROBLEM IMPACT MITIGATION PLAN Fuel Farm If no further action letter from the DOE, M M Working with Environmental to Monitoring existing wells may have to be relocated at abandon as many wells as Wells an expense to the project. possible. FAA Fiber No impacts anticipated to existing FAA fiber L H Pothole FAA fiber to confirm but will be working around it. location. Tax Rule Project assumed it was eligible for sales tax L M Submitted determination 171 exemption. request to DOR to confirm. Access Fees Port moving toward an access fee and may L M Work though the change request additional scope to support. process if needed. Design Risks Project proceeds design for SAMP near- H H Track projects and assess term projects. Changes for forward changes as they develop. compatibility are probable. 23
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